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DIN CEN/TS 17661Personal identification - European enrolment guide for biometric ID documents (EEG); German version CEN/TS 17661:2021standard by Deutsches Institut Fur Normung E.V. (German National Standard), 05/01/2022
DIN CEN/TS 17660-1Air quality - Performance evaluation of air quality sensor systems - Part 1: Gaseous pollutants in ambient air; German version CEN/TS 17660-1:2021standard by Deutsches Institut Fur Normung E.V. (German National Standard), 04/01/2022